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CVE-2021-35210: Cross site scripting in the system log

July 1, 2021 (updated April 17, 2025)

It is possible to inject code into the tl_log table that will be executed in the browser when the system log is called in the back end.

References

  • contao.org/en/security-advisories/cross-site-scripting-in-the-system-log-2021.html
  • github.com/FriendsOfPHP/security-advisories/blob/master/contao/contao/CVE-2021-35210.yaml
  • github.com/FriendsOfPHP/security-advisories/blob/master/contao/core-bundle/CVE-2021-35210.yaml
  • github.com/advisories/GHSA-h58v-c6rf-g9f7
  • github.com/contao/contao
  • github.com/contao/contao/security/advisories/GHSA-h58v-c6rf-g9f7
  • nvd.nist.gov/vuln/detail/CVE-2021-35210

Code Behaviors & Features

Detect and mitigate CVE-2021-35210 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →

Affected versions

All versions starting from 4.5.0 before 4.9.16, all versions starting from 4.10.0 before 4.11.5

Fixed versions

  • 4.9.16
  • 4.11.5

Solution

Upgrade to versions 4.11.5, 4.9.16 or above.

Impact 6.1 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Learn more about CVSS

Weakness

  • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Source file

packagist/contao/core-bundle/CVE-2021-35210.yml

Spotted a mistake? Edit the file on GitLab.

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